We also have a similar phenomenon here in the US with our $2 dollar bills. They're legal tender and most people know about them, but they're very rare to see i

We also have a similar phenomenon here in the US with our $2 dollar bills. They're legal tender and most people know about them, but they're very rare to see in circulation and use so there's the occasional shopkeeper or business that refuses them out of either ignorance or abundance of caution.